Mike.J Well-known member Joined Jan 4, 2022 Messages 226 Reaction score 74 Apr 25, 2022 #1 This page: https://www.aico.co.uk/technical-support/guides-and-publications/ half way down: Electrical Contractors Handybook – 5th Edition
This page: https://www.aico.co.uk/technical-support/guides-and-publications/ half way down: Electrical Contractors Handybook – 5th Edition